133641521577 has 12 divisors (see below), whose sum is σ = 193040947060. Its totient is φ = 89092873728.

The previous prime is 133641521561. The next prime is 133641521623. The reversal of 133641521577 is 775125146331.

133641521577 is a `hidden beast` number, since 1 + 3 + 3 + 64 + 15 + 2 + 1 + 577 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 121037193216 + 12604328361 = 347904^2 + 112269^2 .

It is not a de Polignac number, because 133641521577 - 2⁴ = 133641521561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (133641521527) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 897249 + ... + 1035537.

Almost surely, 2^133641521577 is an apocalyptic number.

It is an amenable number.

133641521577 is a deficient number, since it is larger than the sum of its proper divisors (59399425483).

133641521577 is a wasteful number, since it uses less digits than its factorization.

133641521577 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 245672 (or 245669 counting only the distinct ones).

The product of its digits is 529200, while the sum is 45.

The spelling of 133641521577 in words is "one hundred thirty-three billion, six hundred forty-one million, five hundred twenty-one thousand, five hundred seventy-seven".